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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f3ef6ce3db81c501913e0a752c315d4de53e15bbf716d2dce075cac622dd4f' 
  AND token = 'p6frv0As3aAd2LruRkJOBPuyXFPBrfzSZYs8BU9msDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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