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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd7af3bc47f4e6aed5d23e508337ac15249e517d2fa9ebc78fc91a128b7647c' 
  AND token = 'oHGFCxiUz5k7oaadVDfMEGxdX8e0fnfcWsK5GK2g7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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