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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319c4cdda4681b17e53814ba91d0c31be880cdaae8fb22815e1657c58fb2d661' 
  AND token = 'KCtTA5lvFZSaFo6KVg51LGpWpLp+975Oadwgq7h1cgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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