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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567e7551a321de01e215b945e2601d72d595b219c3277a5a4bc8b1066b3ef67f' 
  AND token = 'SUHefFNMAjss69EpWizJoPrWdZEiHt3+Km5W/XmHlLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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