SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccea160fcc3a967cfbcb65ca5e816ca0c6818f13034786921144db588b76992d' 
  AND token = 'SjyEJptqndbqvV4ZA4hTUmjg6a8D3lCegOdLUnsK7GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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