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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd399c31366534d517713e3bda04755b09181bea9af1caca327f3cda0d05db30a' 
  AND token = 'sbO155BhmD1AjcmNFzTNlM9382si+7s15Rv/QiR3A9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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