SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69528d6129a3e7b8d277f3c298248f986b34eeb5cd4854b7fd37a52eacb7aad3' 
  AND token = 'pis6nZpvfCCxopji4mBYQ1S3y+62yl0vcKgRKDHS/gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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