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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec24d7041a11c14cba9478d3a19089671ebb2c621ccd9b956e6d8be2a4cef57' 
  AND token = 'hZgJSoe6nNEUJx15wECObrA2HEUh00VqB+PVqdK0x0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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