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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7e259c12b185b39ba0f75f3c9cbc23411718fe308f75346f6ced81d81ac36b' 
  AND token = '4k/fsD4MNG4vttUOxunGuL+z+oQIL/4gafdjqrxT5jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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