SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e118d8677f3e6772a9bad59840f70cd6d96f8ae5fa942ea1efa37c1fbc301d' 
  AND token = 'acC6RppFctIOWbjWomnMIUKyYszLJ3VfOgnPi+SUJvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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