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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd5576f1205688ae765eadf8d13ad4d49ec4b2ad9deb11ab9f7800d27d30788' 
  AND token = 'AQYtIl3qiJsklMnA65aKDMYNOIc5FS1y7FPuSC5v8VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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