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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048e7398ee1bacc20e697bb799374e125a428ad2971532a0917e8afa4da9daea' 
  AND token = 'HVTIOJkz0XF0jSxl7zA6BI5fa2CQlBRl6zWdEQh3uHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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