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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324aa0056d58e09cc0387677e273d5741ce43d8542947724be63b671f2ebbcd8' 
  AND token = 'FPXn8X0PLnK7iYQMTpXuC23oIhGpc7RcxGBmC45fGHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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