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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b6c313dac4379850e3759e4e17bf67c964860411092aa5ec8693e5d215da55' 
  AND token = 'tHyQ5pyyDx4PEXYygD0KiIoehI4YJ/LZZcQzCmmPCdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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