Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f16a722da31b5c82f0bcb73dabadfaa9d8f4857086594e3e024103279d0bc10' 
  AND token = 'aSfvKPIQ5JIoEZHwJ36iT3UBOdB+bo73+JbK5H2ZtWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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