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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff140cddb17acdc6c85e5361937bda7d808db0a8890e93f5f194b0ab2ae45e0' 
  AND token = 'vWJrRHG8w30FNQPBbVUtTGafEcBiTr3kqOxJjdWtoFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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