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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82039663ad5ca94ed503f32081ca5f5ed0a41b37df92a9f93b19e90338cbb0e3' 
  AND token = 'ulsTomrH5uPn0ZibND586HZwew0L7MI6yLwY4lmB+Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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