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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0ee61468cb82edb91f85b296ae64c54d6d1ba59331ad635916b4db47c19008' 
  AND token = 'nZCqZacvF7ny2q9HkV0tm/fLkWdwJhfHPQkk6ibDhzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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