SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401a0b0a6526d69904b7b4f378efbe7eba59b1016f5df8e9c5dab56ab16e689b' 
  AND token = 'Hp3YXQOYynabt0Y/A86c6QL7JlOlp9yILoIBqm48HyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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