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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9824f3a4683e8bad56c59dd59ffba50a8dd56bbc55bfb2c593681c59dd013ad7' 
  AND token = 'hPUAjma44bf1pFGanTS0gDy4zi/+s4DFC6BV81isI8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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