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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91da76d2d799d9263a05f07dfaea19584ef278a74b92f177b8d7b9c8f9685111' 
  AND token = '8rH12P/xv3hVdAXFhAGA7aWWrt48gzMfQ9jyaqVlMkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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