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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd09cad2cf6e19d504d9d38d41b486e6ec6a381e5e31d6ce0ee560fd8db08f3' 
  AND token = 'QEtTqQUHdZqyxANn20ScQs7P57eSiKvQhjcjpL/ZSXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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