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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f54d39a76df24fad83d67bd5400f7c255e9281bf3775f60428f9ccc84dedf18' 
  AND token = '5Up14r04Fcwx7bAnrvygMoYIL3xMDRFaYFl5F2wPtpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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