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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e3cceb4ee32889be1e23dd02bc078dd1f7e1ca2a3da2e8118edd2ce6694df0c' 
  AND token = 'IklcDzHeCYgewRTV5DUYWy6fzFUh9hFeo82YJbJOexw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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