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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e483fe5e00816144a910e8eb4852e37934c8ab65b5e5267cd4f8b65bf4ceb4f' 
  AND token = '/dUEN9UZ5sRXHkf/XOVHRGV39K39SXe4/ok5Vk+VWlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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