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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ce5d1a2e2a818e1b4dd932fa2dc7dadf4c619c19deedbb80c705a2a647beb1' 
  AND token = '17aXoRTL3Qy2LmblgR4s/bduJiDWIjQuUQYrV9hhUBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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