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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e73b84b914b7a3882c90a7e88ba190f0bddffcca6976a3a236288c25ab69b22' 
  AND token = '5CJDAbwGIPH8v6QkHhqFlyHflrz7V+3eoIC6BgfVk7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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