SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb86aa0c37ad14b4599a726b0383f6bba1128bbcf6fc3f1425694ffb2ebcd77' 
  AND token = 'P94l4wWYZTIG5OBLANfSJ6/b2PAnj+h2AYhGTOLGRYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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