SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fd04d089fdb3dce41d392c57df5021d0dac40ff9e65b8655762f98490011ae' 
  AND token = '4JhN/jHx0EKoBusYBrUDNMRzBoKDZ0Gia2wor5gTRhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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