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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2e2f702da4794180d55975e7f53a7078682d3e05ad2741a43e52177488c31c' 
  AND token = 'Ura+PCXM55SitXICbBroYDMYM9p1nH57kBI8pkpeGZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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