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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b67e96cc8e35f37e1d02d4e1bc0c61ccc1a2ff2535c23cdf1721d20cdd5977' 
  AND token = 'n7vhQeOKOB3h3BrwTzRBn17YPpIMkcMC7gmiR5ihr3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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