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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e9f2b43ef2cb7a4678e7168f64fbb7eb6dd1af36b7d29af116c69552db748f' 
  AND token = 'sHOZx08QyC3V+OIyfy3J3nhNALSpyorJjlHLJWrhFCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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