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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ca65a132c77c39e6bd60f8e7ba876eef67bc576159c97cad0b16b41575907d' 
  AND token = 'qR+Ccbdb+v7UxH8XGnRNtQIjMkkD9qFJ1CQ0BqOcbeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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