Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3349160d0dd11b60d7e4b9a1e6f52e7e407da294f99a899b78587dede47b59c' 
  AND token = 'bOMFqjErAWvY9bvyVeSwdAwiQmryRBWtwfkLx+JMCSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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