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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2320706dec1d25660d20e488d65da57114d8bbac114fd25efdfe42b8890493a7' 
  AND token = 'dY78PTdjLYTI3eu1Slpnc0z4rUoOD2aB/obbaxGkWVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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