Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833977e95efbd0386ce4b127076c33539687a9a0dbc3b9ec3542bb1347ee59cf' 
  AND token = 'vSENg9vrwFXCXdQx135CHpMEYcMmn3n96G8navySHxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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