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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd669404b855d3688e2d9e876c67e3555a8e4732f37b78d7520aab141daef57b' 
  AND token = 'xDgvxx34C2Ebe7ndnrX82daXH/JZbBqHdpZeMO7gVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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