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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30028c5c03e3e11ac8cdf1a5085da636d8e37e4f280626164ba12513fc6baa46' 
  AND token = 'jtq9sOX+orvtZtD09CGr1mrvT4Sl+MBvHazq4utnkWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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