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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceacd5ad8adfa72687ea18de1069da7066ff73cbcff48f28da20e9eb50d53c8f' 
  AND token = 'maELO5bFFzBovjU5S2DD8TUnWtmhsrpmVy7ffHG/okA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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