SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16621f5c4faca7f54a3b53da2fa79c92fd307e8c80cbb83d2dcd6bd0e8fad89' 
  AND token = 'SbFEVwSNdhvE+zehLaBIT03gSw7u/jwBHhZ1huFj4+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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