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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d57de1d3ec54954ef264f21ba44991db0df2590eabfb4bfd09007069263f1d' 
  AND token = 'Yru1TdtvaJzs3bVRWeftaJmIic8OhCiw1Zro/D1BD4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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