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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a88dad02e04d7ab1996bd24fd0e2c07ebd51d4a9914f8196d29bc6e7f14eaa' 
  AND token = 'dUzNxOrJrLjuHArmByXq7sbyW8T07jDDcvYCDkd3rHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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