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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670d3b0cf0217f1fa124aae362b50dbdab0adbb2689c4bffad390bb58cd83807' 
  AND token = 'oco0HrQ591e4JDnHKbKLUgd0NKU5vNCN+WDMN7EwV1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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