SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b3113f4a17692904a9e2a479ebe0045d1be765ff980dd14d40d6474735314c7' 
  AND token = 'EhFrPBEPwerKqE1si+LwjZlvPXGJrgD+qTpW0oKGtFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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