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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fedc65b4cd4e1b12dfc00018149166427df1328c957b113dc29d4ac598fdc1a' 
  AND token = '1C5r82h+7ot6DVl3nX0Vj5q36oEO6sWHuHgVEq1nIcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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