SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01384e67085651ccf06813fdf81fd0814978e73597882d56852eccb227864a53' 
  AND token = 'wkRK7JZLhpDdJx+K7YWHkRBBUjxLBpOWxROvULTDsA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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