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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9559ad0ae0ec1b946033e3033a17b8ba2407607ea3d72c31e5ca5b205e72e9' 
  AND token = 'iPPLPzjmBXibhMZLhK6wn2RChHgUzndOl2wkaQ8O7Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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