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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4529c88a6ff36f0d27f6ae911a39b575d268c2ba617db4e1bb115cdc0f369b8c' 
  AND token = '8jF3wD2xeM6AKsMQK27Cb9tohUzh6ehIXSaPQLzToXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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