Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb68b00da7c0bb4109a2180f07bdac7b24c41c51105e747ddf917d8445010790' 
  AND token = 'CwNFL95yaeaCmrnCV2Ltuz3jPiLubnZlv42xCXPVcJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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