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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf71ee68b85e1380e1703bbfc679d8fd26ed03bd6d52d054a4e1a1053771e641' 
  AND token = '2U92j5IJcxzs0+MM5avZ63NdpsVGfes8vT2u9/pi2nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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