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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8175db2bb4a16b4c57d8266889a163c07a2591913ec665a8acc3564f9a6fa936' 
  AND token = '8RxQ4vxoK4jkrjHpI5TYVa5Py+PPZy5fWXKWKffNvVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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