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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201ef10672a88c73118fcf787be7ae6c9115e45ddde43230ea84665047f9977d' 
  AND token = 'nTKSkyHVI26kjLqta/lAAcXomyKfrM2swSFT6MD6AoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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