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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab31862efc67f8cf6b9226b1db6fd3ef00a6fe47171b8e7e78990b613591278' 
  AND token = 'riqlOidALCHSCsqxbh7ATxViyZvwYTl1xKea5m9tRAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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