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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ffb8937cd5b84bb64d92be7e261ceb6f8b1b9da683ee79a073916f77411e96' 
  AND token = 'lG6V2JK0yfi0tOabWuMq799hn+WXZF/N7XewFiq0h5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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