SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60af87e5f06e517734309cb9d33463b86f0fb087bc4e9be581b24a174d3c9756' 
  AND token = 'SNYOjymtsn7JiIvvMh+6CIyWdq+dpPGOoV2vfqi9ZMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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