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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18fbd4705d9af795cb430d66be5bb754fdf8faf21258d7229159bd84855c65e' 
  AND token = '//Hlyi68f1psXvAkh+EjQIJAAGCm7r56wGi7syOQIjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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