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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfb37c4a3e6a4f1ead2610c6b8c27ca60a448db286ad14c2457edbd1561d32c' 
  AND token = 'iNrHtPuP9o7g60kZ9iJ16g1orsqLaHEe5r44gnDAcWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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