Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e964eca97eb1caad4594f3c13e5d2f78516255fb93a22087929082650aa25e5' 
  AND token = 'zJzRFKS2VwiJuRFIUmnTV4py8tDcXD/F9nZXpNwyocU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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