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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92c05c440df902b9adf2e43fcb301027f1fd6878b52ec123a7670c2dad58ec4' 
  AND token = 'aeUZ3gbTYRe3O2YkW5XoHxMrnRiYGzJSpX01vQMj5K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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