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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a17f8d833a5e774159c2ada224b45d642bb2fb619c45a679f6b1734db1547b' 
  AND token = 'eT7GcqpYv7VX0Z6CaPrCRLk5h89lz3dwm07llX9RxpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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