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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685bf0bdf75b876252aa5af3352ce675c995637a4fa9591f5b9e7af63f17e805' 
  AND token = 'tDsOyKJP5gy/ZFqb43VKe4hKPohamagCSgso2tQDMBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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