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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd040c8afdef6b52ac50bb0051b36443f84c0352200e42e275f9db9c8d0a5025d' 
  AND token = 'JJBfy6WVNsyN4yyH8Iil4JOYFdIboFVVd/23u1mBxQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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