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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2245d4bb5666dafad46a7c622d4daa20896bcfa2042b7aeb94ca535c4aa94d37' 
  AND token = 'Ti6GA3YOeVWidPfq+ltICgYcWQh6HwDw1FNizFbjPj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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