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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381f102b6d8aaf23279bb0f83284de0175c7acf9883841dfc0309f36e04d63e3' 
  AND token = 'dvJDNSo8zOWsb9EVHvq2b/7Vka5D5PiT7Ub02A1Lo9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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