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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c4d05dfede13b4d1156941bcdf1efcf6eaec47141115ffc775e8feb5c3f87d' 
  AND token = '7jp9kd6eokw8mD/tcEi3JsXKDecmOt+pWS8Ie0feEk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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