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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c6df9bbd547e7b723efebbbeee37a20505a6415f72072c86e79ce92d24f832' 
  AND token = '5ot9wAutPa6O63YWx6Puslzk/P5piY9t/AyYaTh9mBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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