SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce107c6b8d0c6be7c730ea4e51248269bb247f298b1f4b9328ad157c7dbb850c' 
  AND token = 'dgHQJbXuIKkIa0b0wEVjVJJmZRwr46/TFW9GvjiPBvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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