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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3895001b43305304b7b7429ad5260939fb1a18e3501655e18624c986335434c3' 
  AND token = '4y/wQ8mq8NjE6UT86CJ3hxbLqKbEwimvtoEwCfFP+00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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