SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c0ec23b5b3a7b4a865150fda9805d83eef002febef42f5b85d73dbc912e1c6' 
  AND token = 'N4A2UvuM7D4a0fQBl+i49GMPb8BZmJVj7dCgmhDFoDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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