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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f4ec7656a2be462b798a08b277bbbfe5c8f942a833ea45acc42a7bcddad47e' 
  AND token = 'xnjUI3xdVHv34olx+829sPy1IZcpNHRPpS0d0flewiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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