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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4e5ca868adcc73a94a9d4642c63d6b9d05ec50d8ad3ff5d56f4b021ac18e72' 
  AND token = 'ya6LuOTZ3xFDykk1dMcajujBGEimRh5U13JUmq8sKqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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