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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f9a4a3c354b90d21c58eff3890d3e080985bf366f59e940d5276a5d1629ace' 
  AND token = 'JsBT7A7LxhjqXzqameH8INAntHW14nJSAjV9a7sRaWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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