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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ba0eab5c7356e9053e65ae6bb18820f064b6936f6bc731b05aa5586bc50b9b' 
  AND token = '+BLzEnCYuUYyVtvs5RAOBsSUmIDShPpa6pSPdO41ieQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}