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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0334332543d6eb78b651d11243c8276aadbb503aad56b3d192de49fdbd14d2b6' 
  AND token = '8OXrgUXb5Jef5BR8Dzkk2O5vBiTH0GmKWrnHpUh9JsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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