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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8ef7f918de7b760ceefec6d07c3dab557fcdc7937e3df4cb95c632cb4ac3a9' 
  AND token = 'ZCsDln8y2dy9Km6XtZwkiDNc1WzAxEMQQRcXjTk8294=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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