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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8137fefd44e6d22c2c0c97a7c5479dc22311f2ea244c6520d9cac242e9c69e16' 
  AND token = 'dKoI53Y9LS55MSIMKFE8PzHI3FXcaboEdiqscAlsEGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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