SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a6d32c02718b817c01a1ec794b63d48b69b3c53ecf86dc7f9484370659e519' 
  AND token = 'ZhDkaDyK+wX0WjV24kYBN7vyKdySJFoEOvWc9KuFxTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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