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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bbd80fa2600b613192e062f98dd322f59aae08ab23a5743f32de320d4a8077' 
  AND token = '8pynsG/kuCSmrjZNOvSnLJQral22n2KuVkKGO26ozIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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