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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35000713213494f13b0a599e9006d88117cb08c98c939fd4f99ec275478af32' 
  AND token = 'RqXw20ckx6xgnZ6Zu0qnZ9TJBUg/hjwE+f2Cf0n6amA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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