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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433ce69a14a16fe0c4cd2ecb40fcc14fe1b41985a77e04f41d0245d8dce47bfb' 
  AND token = 'Or+G+gTnLeIiyK7wOrSG2uZ6pM74IHTefpMtn9EpMoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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