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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca223e8fbb936cfda9ca73445223578c3e00396597480de05ffa51e51dcff23d' 
  AND token = '1R/I13BPr3fG1w71uBs/iHn+BMAhCbhDaQT6xrINK7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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