SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452d5bb99e4b59d61168d025d725f16846b53219c7f5f4764820e7a6645976ae' 
  AND token = '0SXNmDLvwZhW2JdsJ3TsjXNBTV9FQmkBqMIPpf1wy7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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