SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086e241bd39085f743e8929345f777df23e87ba3bc243df99932bd1a8fb5932e' 
  AND token = 'dzwVhucqHDEgDN8vbVTmrnQvrV9BGuo4kNRMrwF1YuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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