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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ef969ca54ae8f670381b39efc44eab52b502c222bd37e83269bcde7ce884e9' 
  AND token = '7srvmXtepFFKTD5wfI8z+mhB23I86BRXdqsrHxkEbt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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