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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97528f6d264599fb2185faad550e5b829292abf731fd849209ceb28da4b0593f' 
  AND token = 'cUGv9+r7O3s+v72vBkM3Emyvx1BbjQHdvh523mAx4wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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