SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b886fe5b83f9dce3e0556c927909149d8426e21ba80369eeaabacc2b4792fe' 
  AND token = 'F0/gq9go+YqSUQQgCtjr8z4iWBl0r2RxpIuponv5fDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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