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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e817683cdd39103e53fed529ca56b2f27e36850941709d5d7882691b370f7f21' 
  AND token = 'idrObqvCH9iZi8SyUhxpbqAwWl3bLqpCqKnkXUJPrus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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