SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40117572c257ace98c019180916273ba254d50ec84c6cbd01315a14f917bfdcd' 
  AND token = 'CS+WonhQgSrBBmLWGPqm6FGYvf2own9IEpe+Wo3stMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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