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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fadb49f3bc8fd30b2baff928ee2c3aab2b231f60d336ad9099bd43de945eb38' 
  AND token = 'SlAyE953VFag9K/YsMzCs9wde9h9UzoU1MGOdarm/aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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