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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6a4d68c9c31f8d4c496f6b088d3578b2ad1b14ab724a03b9de0d173fba4ce0' 
  AND token = '5M8tvpoD2jHx0hQ9EpnICkvfIPifyy9rVvVoHGpSmQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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