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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9001957abd41f3591ed111afb0fe9a8e188f198eda742d38764272f999919612' 
  AND token = '2kwAsU412+FIS0TTJh2KMYVOY8EFJq02yiHXA1rUE3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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