SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd569890258354a355e96b677e5a6551d691449d0b0ef6dd7ce3ed48875d49a6' 
  AND token = 'lLR/hovO8Upqm+hLzHObx2IhizTkFR8G5oqKSgHS/gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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