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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073a455c4de5cec1bd203b4b26c959cfd95cf6dce6e25eb3bebc949fa190c5e7' 
  AND token = '8vpOMN+XQAjkowd5L7WQbjOwYywfO1Lr8bt2DjyF2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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