SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0183bbaf2ce3709016d5f97b6096b34c3b2a2ebad58bfbf393d874782e42436d' 
  AND token = 'PPep5b9qZJ4EJdQDBRw3xJyJLCfIUQWtph+2M/EtVeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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