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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f12a55967bd6fe37ac119726efb322b973b2d80b0aece06474e944e5e826db' 
  AND token = 'Tlfn0N2KsQAX4126QvarfhSkU6qam5CqHQVDX+i6U/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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