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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662410b90b948b9f29ca7543068f092f7a9b65a81f45779c0430f1e8ef46c5f6' 
  AND token = 'kx9mGgi+mqif+UesrKpoqx9F15mg0HDO9DsESqmyQmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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