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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf2256188a7490e8c999b501b88f67bf6e88202c1af416fd3aa64a70c16603b' 
  AND token = '1H+XXjSqoWOsa9zgVzaUxTNvnonHau22t7yil+LbgYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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