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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc156b6a67be3c5f1b77f5fb3dc12ce73a330d6646198c3c5bee568b86d50fe' 
  AND token = 'mMrl0c6aTWOY9FwsIysG7Q3X1+eBg9Vyv+oci5dYphU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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